Net County-to-County Migration Flow (5-year estimate) for Mercer County, NJ was 545.00000 Persons in January of 2020, according to the United States Federal Reserve. Historically, Net County-to-County Migration Flow (5-year estimate) for Mercer County, NJ reached a record high of 6000.00000 in January of 2010 and a record low of -2850.00000 in January of 2015. Trading Economics provides the current actual value, an historical data chart and related indicators for Net County-to-County Migration Flow (5-year estimate) for Mercer County, NJ - last updated from the United States Federal Reserve on May of 2024.